The 'Gangster Squad' actress always wears Chance by Chanel perfume but thinks beauty products differ on each person and admitted Bvlgari doesn't work well on her, leaving her smelling like marijuana.

She told Allure magazine: "The weird thing is, I think there's something off about my PH because things smell totally different on me. When you stay at a Four Seasons hotel they have all this Bvlgari stuff and if I use the body wash I smell like pot the rest of the day. It makes no sense. It mixes with my chemistry and I just smell like I have clam-baked all day."

Emma often changes her hair for movie roles, going from blonde to red and back but admitted not everyone appreciates it.

She explained: "There are sometimes people that I don't know very well that are like, 'Hey, great to meet you. You should go back to red,' and I'm like, 'mmmm good to meet you?'

"I can't do my hair to save my life. If you put a gun to my head I would say shoot me."